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<title>three.js webgl - geometry - extrude shapes from geodata_SVG_Group_SetPixel</title>
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body {
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	overflow: hidden;
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<body>
<canvas id="debug" style="position:absolute; left:100px"></canvas>



<script>
'use strict';
</script>



<script src="three.min.js"></script>
<script src="stats.min.js"></script>



<script>
// From d3-threeD.js
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/. */

function d3threeD(exports) {

const DEGS_TO_RADS = Math.PI / 180, UNIT_SIZE = 100;

const DIGIT_0 = 48, DIGIT_9 = 57, COMMA = 44, SPACE = 32, PERIOD = 46, MINUS = 45;

exports.transformSVGPath =
function transformSVGPath(pathStr) {
	var path = new THREE.Shape();

	var idx = 1, len = pathStr.length, activeCmd,
		x = 0, y = 0, nx = 0, ny = 0, firstX = null, firstY = null,
		x1 = 0, x2 = 0, y1 = 0, y2 = 0,
		rx = 0, ry = 0, xar = 0, laf = 0, sf = 0, cx, cy;

	function eatNum() {
		var sidx, c, isFloat = false, s;
		// eat delims
		while (idx < len) {
			c = pathStr.charCodeAt(idx);
			if (c !== COMMA && c !== SPACE)
				break;
			idx++;
		}
		if (c === MINUS)
			sidx = idx++;
		else
			sidx = idx;
		// eat number
		while (idx < len) {
			c = pathStr.charCodeAt(idx);
			if (DIGIT_0 <= c && c <= DIGIT_9) {
				idx++;
				continue;
			}
			else if (c === PERIOD) {
				idx++;
				isFloat = true;
				continue;
			}

			s = pathStr.substring(sidx, idx);
			return isFloat ? parseFloat(s) : parseInt(s);
		}

		s = pathStr.substring(sidx);
		return isFloat ? parseFloat(s) : parseInt(s);
	}

	function nextIsNum() {
		var c;
		// do permanently eat any delims...
		while (idx < len) {
			c = pathStr.charCodeAt(idx);
			if (c !== COMMA && c !== SPACE)
				break;
			idx++;
		}
		c = pathStr.charCodeAt(idx);
		return (c === MINUS || (DIGIT_0 <= c && c <= DIGIT_9));
	}

	var canRepeat;
	activeCmd = pathStr[0];
	while (idx <= len) {
		canRepeat = true;
		switch (activeCmd) {
			// moveto commands, become lineto's if repeated
			case 'M':
				x = eatNum();
				y = eatNum();
				path.moveTo(x, y);
				activeCmd = 'L';
				firstX = x;
				firstY = y;
				break;
			case 'm':
				x += eatNum();
				y += eatNum();
				path.moveTo(x, y);
				activeCmd = 'l';
				firstX = x;
				firstY = y;
				break;
			case 'Z':
			case 'z':
				canRepeat = false;
				if (x !== firstX || y !== firstY)
					path.lineTo(firstX, firstY);
				break;
			// - lines!
			case 'L':
			case 'H':
			case 'V':
				nx = (activeCmd === 'V') ? x : eatNum();
				ny = (activeCmd === 'H') ? y : eatNum();
				path.lineTo(nx, ny);
				x = nx;
				y = ny;
				break;
			case 'l':
			case 'h':
			case 'v':
				nx = (activeCmd === 'v') ? x : (x + eatNum());
				ny = (activeCmd === 'h') ? y : (y + eatNum());
				path.lineTo(nx, ny);
				x = nx;
				y = ny;
				break;
			// - cubic bezier
			case 'C':
				x1 = eatNum(); y1 = eatNum();
			case 'S':
				if (activeCmd === 'S') {
					x1 = 2 * x - x2; y1 = 2 * y - y2;
				}
				x2 = eatNum();
				y2 = eatNum();
				nx = eatNum();
				ny = eatNum();
				path.bezierCurveTo(x1, y1, x2, y2, nx, ny);
				x = nx; y = ny;
				break;
			case 'c':
				x1 = x + eatNum();
				y1 = y + eatNum();
			case 's':
				if (activeCmd === 's') {
					x1 = 2 * x - x2;
					y1 = 2 * y - y2;
				}
				x2 = x + eatNum();
				y2 = y + eatNum();
				nx = x + eatNum();
				ny = y + eatNum();
				path.bezierCurveTo(x1, y1, x2, y2, nx, ny);
				x = nx; y = ny;
				break;
			// - quadratic bezier
			case 'Q':
				x1 = eatNum(); y1 = eatNum();
			case 'T':
				if (activeCmd === 'T') {
					x1 = 2 * x - x1;
					y1 = 2 * y - y1;
				}
				nx = eatNum();
				ny = eatNum();
				path.quadraticCurveTo(x1, y1, nx, ny);
				x = nx;
				y = ny;
				break;
			case 'q':
				x1 = x + eatNum();
				y1 = y + eatNum();
			case 't':
				if (activeCmd === 't') {
					x1 = 2 * x - x1;
					y1 = 2 * y - y1;
				}
				nx = x + eatNum();
				ny = y + eatNum();
				path.quadraticCurveTo(x1, y1, nx, ny);
				x = nx; y = ny;
				break;
			// - elliptical arc
			case 'A':
				rx = eatNum();
				ry = eatNum();
				xar = eatNum() * DEGS_TO_RADS;
				laf = eatNum();
				sf = eatNum();
				nx = eatNum();
				ny = eatNum();
				if (rx !== ry) {
					console.warn("Forcing elliptical arc to be a circular one :(",
						rx, ry);
				}
				// SVG implementation notes does all the math for us! woo!
				// http://www.w3.org/TR/SVG/implnote.html#ArcImplementationNotes
				// step1, using x1 as x1'
				x1 = Math.cos(xar) * (x - nx) / 2 + Math.sin(xar) * (y - ny) / 2;
				y1 = -Math.sin(xar) * (x - nx) / 2 + Math.cos(xar) * (y - ny) / 2;
				// step 2, using x2 as cx'
				var norm = Math.sqrt(
					 (rx*rx * ry*ry - rx*rx * y1*y1 - ry*ry * x1*x1) /
					 (rx*rx * y1*y1 + ry*ry * x1*x1));
				if (laf === sf)
					norm = -norm;
				x2 = norm * rx * y1 / ry;
				y2 = norm * -ry * x1 / rx;
				// step 3
				cx = Math.cos(xar) * x2 - Math.sin(xar) * y2 + (x + nx) / 2;
				cy = Math.sin(xar) * x2 + Math.cos(xar) * y2 + (y + ny) / 2;

				var u = new THREE.Vector2(1, 0),
					v = new THREE.Vector2((x1 - x2) / rx,
					                      (y1 - y2) / ry);
				var startAng = Math.acos(u.dot(v) / u.length() / v.length());
				if (u.x * v.y - u.y * v.x < 0)
					startAng = -startAng;

				// we can reuse 'v' from start angle as our 'u' for delta angle
				u.x = (-x1 - x2) / rx;
				u.y = (-y1 - y2) / ry;

				var deltaAng = Math.acos(v.dot(u) / v.length() / u.length());
				// This normalization ends up making our curves fail to triangulate...
				if (v.x * u.y - v.y * u.x < 0)
					deltaAng = -deltaAng;
				if (!sf && deltaAng > 0)
					deltaAng -= Math.PI * 2;
				if (sf && deltaAng < 0)
					deltaAng += Math.PI * 2;

				path.absarc(cx, cy, rx, startAng, startAng + deltaAng, sf);
				x = nx;
				y = ny;
				break;
			default:
				throw new Error("weird path command: " + activeCmd);
		}
		// just reissue the command
		if (canRepeat && nextIsNum())
			continue;
		activeCmd = pathStr[idx++];
	}

	return path;
}
}

var $d3g = {};
d3threeD($d3g);
</script>



<script>
/// Part from g0v/twgeojson
/// Graphic Engine and Geo Data Init Functions

var addGeoObject = function( group, svgObject ) {
	var i,j, len, len1;
	var path, mesh, color, material, amount, simpleShapes, simpleShape, shape3d, x, toAdd, results = [];
	var thePaths = svgObject.paths;
	var theAmounts = svgObject.amounts;
	var theColors = svgObject.colors;
	var theCenter = svgObject.center;

	len = thePaths.length;
	for (i = 0; i < len; ++i) {
		path = $d3g.transformSVGPath( thePaths[i] );
		color = new THREE.Color( theColors[i] ); 
		material = new THREE.MeshLambertMaterial({
			color: color,
			emissive: color,
		});
		amount = theAmounts[i];
		simpleShapes = path.toShapes(true);
		len1 = simpleShapes.length;
		for (j = 0; j < len1; ++j) {
			simpleShape = simpleShapes[j];
			shape3d = simpleShape.extrude({
				amount: amount,
				bevelEnabled: false
			});
			mesh = new THREE.Mesh(shape3d, material);
			mesh.rotation.x = Math.PI;
			mesh.translateZ( - amount - 1);
			mesh.translateX( - theCenter.x);
			mesh.translateY( - theCenter.y);
			group.add(mesh);
		}
	}
};

var init3d = function(){

	/// Global : renderer
	renderer = new THREE.WebGLRenderer( { antialias: true } );
	renderer.setClearColor( 0xb0b0b0 );
	renderer.setPixelRatio( window.devicePixelRatio );
	renderer.setSize( window.innerWidth, window.innerHeight );

	/// Global : scene
	scene = new THREE.Scene();

	/// Global : camera
	camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 1, 1000 );
	camera.position.set( 0, 0, 200 );

	/// Global : group
	group = new THREE.Group();
	scene.add( group );

	/// direct light
	var light = new THREE.DirectionalLight( 0x404040 );
	light.position.set( 0.75, 0.75, 1.0 ).normalize();
	scene.add( light );

	/// ambient light
	var ambientLight = new THREE.AmbientLight(0x404040);
	scene.add( ambientLight );

	/// backgroup grids
	var helper = new THREE.GridHelper( 80, 10 );
	helper.rotation.x = Math.PI / 2;
	group.add( helper );

	var obj = initSVGObject();
	addGeoObject( group, obj );
};

var initSVGObject = function() {
	var obj = {};

	/// The geo data from Taipei City, Keelung City, Taipei County in SVG form
	obj.paths = [
		/// Taipei City
		"M366.2182,108.9780 L368.0329,110.3682 L367.5922,112.4411 L369.9258,116.0311 L368.9827,117.3543 " +
		"L371.5686,119.8491 L370.5599,121.7206 L372.9314,124.8009 L368.8889,126.7603 L369.2695,130.7622 " +
		"L366.1499,130.3388 L363.4698,128.1161 L362.9256,125.6018 L360.8153,126.4025 L360.2968,124.3588 " +
		"L361.9519,121.1623 L360.4475,118.7162 L358.1163,117.8678 L358.7094,115.7577 L361.6243,112.4576 Z",
		/// Keelung City
		"M380.2689,113.3850 L383.5604,114.2370 L383.7404,114.2386 L385.4082,115.6247 L384.9725,117.4631 " +
		"L381.6681,117.9439 L383.0209,121.0914 L379.4649,122.7061 L373.4987,118.8487 L372.0980,114.7589 " +
		"L377.9716,112.0707 Z",
		/// Taipei County
		"M359.4486,155.6690 L357.0422,152.7420 L355.1688,148.0173 L357.1186,145.8045 L354.1323,141.2242 " +
		"L351.1807,141.6609 L348.9387,140.5372 L349.5415,137.8396 L347.5174,136.1694 L347.6299,129.2327 " +
		"L351.4192,128.8067 L354.2518,125.3113 L352.5805,121.8038 L349.3190,120.9429 L344.3277,116.7676 " +
		"L350.9772,115.1221 L354.5759,112.5371 L354.5667,110.6949 L357.4098,105.7489 L362.3963,101.8443 " +
		"L364.4415,101.0819 L364.5314,101.0828 L364.6209,101.1230 L364.7698,101.2029 L368.1221,101.5115 " +
		"L371.7216,104.1338 L372.2958,106.7261 L375.5949,109.6971 L377.0415,108.8875 L377.0737,108.6526 " +
		"L377.4037,108.6165 L376.8840,109.7091 L376.7323,109.9037 L377.9416,112.0705 L371.7970,114.8736 " + 
		"L374.0935,119.4031 L380.7848,122.7963 L382.6529,121.9897 L381.5792,117.8256 L385.0339,117.3069 " +
		"L385.4082,115.6247 L388.7014,116.3969 L389.8697,116.6024 L390.0206,116.4860 L391.0396,116.6118 " +
		"L394.6665,116.9929 L394.4694,119.2255 L394.3172,119.4987 L395.3792,121.8977 L395.2728,124.0526 " +
		"L397.2123,125.6350 L401.1709,126.2516 L401.2612,126.2130 L401.4086,126.6060 L400.1992,127.7733 " +
		"L399.7769,128.0446 L399.6247,128.3179 L398.1779,129.0521 L394.2418,129.2969 L388.7324,130.9385 " +
		"L389.2782,134.0003 L383.7237,137.0111 L381.7445,139.9336 L379.7001,139.9546 L376.1539,143.0580 " +
		"L371.3022,144.1094 L368.6009,146.5914 L368.7361,151.1399 L363.6153,154.4980 " +
		/// Taipei County hole.
		"M363.4600,128.3904 L366.6300,130.3829 L369.3732,129.3913 L369.5603,125.6695 L374.3989,125.1677 " +
		"L370.8412,123.6440 L371.0684,118.8252 L369.0431,117.3157 L369.6882,115.7936 L367.8578,112.8749 " +
		"L368.1217,110.4867 L366.5152,109.2554 L361.9554,112.3435 L358.1163,117.8678 L361.7218,120.2192 " +
		"L360.7261,126.3232 L362.8064,125.5221 Z"];

	obj.amounts = [ 19, 20, 21 ];
	obj.colors =  [ 0xC07000, 0xC08000, 0xC0A000 ];
	obj.center = { x:365, y:125 };

	return obj;
};
</script>



<script>
	/// Events from extrude shapes example

	function onWindowResize() {

		windowHalfX = window.innerWidth / 2;
		windowHalfY = window.innerHeight / 2;

		camera.aspect = window.innerWidth / window.innerHeight;
		camera.updateProjectionMatrix();

		renderer.setSize( window.innerWidth, window.innerHeight );
	}

	function onDocumentMouseDown( event ) {

		event.preventDefault();

		document.addEventListener( 'mousemove', onDocumentMouseMove, false );
		document.addEventListener( 'mouseup', onDocumentMouseUp, false );
		document.addEventListener( 'mouseout', onDocumentMouseOut, false );

		mouseXOnMouseDown = event.clientX - windowHalfX;
		targetRotationOnMouseDown = targetRotation;
	}

	function onDocumentMouseMove( event ) {

		mouseX = event.clientX - windowHalfX;

		targetRotation = targetRotationOnMouseDown + ( mouseX - mouseXOnMouseDown ) * 0.02;
	}

	function onDocumentMouseUp( event ) {

		document.removeEventListener( 'mousemove', onDocumentMouseMove, false );
		document.removeEventListener( 'mouseup', onDocumentMouseUp, false );
		document.removeEventListener( 'mouseout', onDocumentMouseOut, false );
	}

	function onDocumentMouseOut( event ) {

		document.removeEventListener( 'mousemove', onDocumentMouseMove, false );
		document.removeEventListener( 'mouseup', onDocumentMouseUp, false );
		document.removeEventListener( 'mouseout', onDocumentMouseOut, false );
	}

	function onDocumentTouchStart( event ) {

		if ( event.touches.length == 1 ) {

			event.preventDefault();

			mouseXOnMouseDown = event.touches[ 0 ].pageX - windowHalfX;
			targetRotationOnMouseDown = targetRotation;
		}
	}

	function onDocumentTouchMove( event ) {

		if ( event.touches.length == 1 ) {

			event.preventDefault();

			mouseX = event.touches[ 0 ].pageX - windowHalfX;
			targetRotation = targetRotationOnMouseDown + ( mouseX - mouseXOnMouseDown ) * 0.05;
		}
	}

	function animate() {

		/// compatibility : http://caniuse.com/requestanimationframe
		requestAnimationFrame( animate );

		render();
		stats.update();
	}

	function render() {

		group.rotation.y += ( targetRotation - group.rotation.y ) * 0.05;
		renderer.render( scene, camera );
	}
</script>



<script>
	/// Main

	var renderer, stats;
	var scene, camera, group;

	var targetRotation = 0;
	var targetRotationOnMouseDown = 0;

	var mouseX = 0;
	var mouseXOnMouseDown = 0;

	var windowHalfX = window.innerWidth / 2;
	var windowHalfY = window.innerHeight / 2;

	var container = document.createElement( 'div' );
	document.body.appendChild( container );

	var info = document.createElement( 'div' );
	info.style.position = 'absolute';
	info.style.top = '10px';
	info.style.width = '100%';
	info.style.textAlign = 'center';
	info.innerHTML = 'Shapes Extrusion via Geo Data<br/>Drag to spin';
	container.appendChild( info );

	init3d();

	container.appendChild( renderer.domElement );

	stats = new Stats();
	stats.domElement.style.position = 'absolute';
	stats.domElement.style.top = '0px';
	container.appendChild( stats.domElement );

	document.addEventListener( 'mousedown', onDocumentMouseDown, false );
	document.addEventListener( 'touchstart', onDocumentTouchStart, false );
	document.addEventListener( 'touchmove', onDocumentTouchMove, false );
	window.addEventListener( 'resize', onWindowResize, false );

	animate();
</script>



</body>
</html>
